package com.ethanzzh.ethanzzh_xdclass.interceptor;

import com.ethanzzh.ethanzzh_xdclass.utils.JWTUtils;
import com.ethanzzh.ethanzzh_xdclass.utils.SimpleResponse;
import com.google.gson.Gson;
import io.jsonwebtoken.Claims;
import org.springframework.http.HttpRequest;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class LoginInterceptor implements HandlerInterceptor {

    private static final Gson gson = new Gson();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("token");
        //有可能token放在变量里面
        if (token == null) {
            token = request.getParameter("token");
        }

        if (token != null) {
            Claims claims = JWTUtils.checkJWT(token);
            if (claims != null) {
                Integer id = (Integer) claims.get("id");
                String name = (String) claims.get("name");

                request.setAttribute("user_id", id);
                request.setAttribute("name", name);
                return true;
            }

        }
        sendJsonMessage(response, SimpleResponse.fail("请登录"));

        return false;
    }

    //响应数据给前端
    public static void sendJsonMessage(HttpServletResponse response, Object object) throws IOException {
        response.setContentType("application/json; charset=utf-8");
        PrintWriter writer = response.getWriter();
        writer.print(gson.toJson(object));
        writer.close();
        response.flushBuffer();


    }

}
